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Old 7th February 2013, 04:39 PM   #31
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Default We have found a mistake, a bypass capacitor not connected to ground

Because of that Juan has fixed the layout.

Here you have them.

regards,

Carlos
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Old 13th February 2013, 12:41 PM   #32
wiljj78 is offline wiljj78  Philippines
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Default DX Super A Ragulated PSU

Uncle Charlie,

According to the set of condensers and power transistors are they capable enough to drive DX Super A stereo in 2 Ohms load?

If not what would be the required changes? to obtain 1 Regulated PSU to drive stereo in 2 ohms load?

Regards,
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File Type: jpg DX Regulated PSU Green.jpg (360.0 KB, 438 views)
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Old 13th February 2013, 11:41 PM   #33
abetir is offline abetir  Philippines
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Uncle Carlos,

Are those vertically mounted resistors of 2watter rating?..and what is the rating of BZV55-C12 zener, I have been consulting datasheets but it seems it was of SMD type.

Thank You!


@willjj78
Holeee...your diode is huge man!
Nice lay-out!, do you happen to have a lay-out for MB5010W type of bridge diode? Those inline pin type of bridge diode in PH comes in low amperes.

Regards!

MB5010W datasheet(1/2 Pages) MCC | 50 Amp Single Phase Bridge Rectifier 50 to 1000 Volts
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Old 14th February 2013, 06:36 AM   #34
wiljj78 is offline wiljj78  Philippines
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@willjj78
Holeee...your diode is huge man!
Nice lay-out!, do you happen to have a lay-out for MB5010W type of bridge diode? Those inline pin type of bridge diode in PH comes in low amperes.

Regards!

MB5010W datasheet(1/2 Pages) MCC | 50 Amp Single Phase Bridge Rectifier 50 to 1000 Volts[/QUOTE]

...Why not? just waiting Uncle charlie's confirmation about few questions so i can finalize, stay tuned....

Regards,
Wiljj78
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Old 14th February 2013, 03:39 PM   #35
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Hey dear Willy I really don't want to to change you idea of using those large bridge rectifiers but if you are happy with that is just fine be happy, but I guess is not that necessary to use so large unit you can use smaller unit too save money, this is how I see Dx Regulator the bridge rectifier you see in this illustration just cost 2 dollar and some change, remember Dx Regulator is a like a water tank and some valves that control the fluids, so the rectifier is just a big lake or river is just provide the water and the valves control the fluids, that is the way I see it, the capacitor act as a large reservoir thank, and the Dx Regulator act as a valve control unit and also filters the impurities from the mains of the lake like rocks sand dirt, sorry this might be to confuse but is the way I see it I hope you like my thinking dear Willy.

Regards
Juan
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Last edited by vargasmongo3435; 14th February 2013 at 04:08 PM. Reason: grammar error
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Old 14th February 2013, 03:57 PM   #36
wiljj78 is offline wiljj78  Philippines
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Quote:
Originally Posted by vargasmongo3435 View Post
Hey dear Willy I really don't want to to change you idea of using those large bridge rectifiers but if you are happy with that is just fine be happy, but I guess is not that necessary to use so large unit you can use smaller unit too save money, this is how I see Dx Regulator the bridge rectifier you see in this illustration just cost 2 dollar and some change, remember Dx Regulator is a like a water tank and some valves that control the fluids, so the rectifier is just a big lake or river is just provide the water and the valves control the fluids, that is the way I see it, the capacitor act as a large reservoir thank, and the Dx Regulator act as a valve control unit and also filters the impurities from the mains of the lake like rocks sand dirt, sorry this might be to confuse but is the way I see it I hope you like my thinking dear Willy.

Regards
Juan
Hello Dear Jaun,

Completely agree the way your thingking my dear, but you know my way of building my projects i always use junk/recycled parts rather than buying....thats why i always customize my build in order to use my parts on stock, i think that's the way i can save money rather than buying new parts... If you notice i have asked uncle charlie if this design would be capable to drive stereo in 2 ohms load that means i wish/need only to have 1 stabilizer pcboard rather than 2 PSU pcboard for stereo DX Super A (if possible), and thats the entire idea why i increase the rectifier.

Regards,
Wiljj78

Last edited by wiljj78; 14th February 2013 at 04:15 PM.
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Old 14th February 2013, 04:11 PM   #37
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ahaaaaa now I see, good dear Willy just great so you actually build according to your parts, I like that my man I like that very good! yes Carlos post all that info in post #420 Carlos has it all 9 yards cover already dear Willy


It can put out more or less 70 watts at low distortion... can go more, with reasonable distortion, can reach 90 watts RMS at 8 ohms.... in this case you have the need of 150 to 180 watts (VA) transformer to 1 channel.... to each channel .... if you decide to use a single transformer and a single supply to feed two channels, then you must have a 300 to 360 watts (VA) power transformer..depending if you adjust your volume lower than the threshold of distortion or higher than the threshold of distortion....this depends on the music you play and the volume you like to play and how sensitive are your ears to clipping and harmonic distortion....

Transformers are 30 plus 30 volts AC, because after rectification and filtering you gonna have a resultant DC voltage of 42 plus 42 volts.

So, first answer goes to 8 ohms.....transformer should be 150 watts(VA) each if you intend to buy two transformers........or 300 watts (VA) to feed two channels using a single transformer.

So, second answer goes to 4 ohms speakers.... transfomer should be twice the above current.... 300 watts each one of two transformers if you intend to buy two transformers and to make two separated supplies, each one of them to feed one channel...or 600 watts (VA) single transformer if you intend to use a single power supply.

So, third answer goes to 2 ohms speakers.... transformer should be twice the above current, or 600 Watts (VA) each one of two transformers if you intend to buy two transformers and to make two separated supplies (transformer, plus rectifiers plus filters).... but if you decide to use a single power transformer to feed two channels..then the choice will be 1200 watts power transformer.

This amplifier can put out aproximatelly 70 watts at 8 ohms each channel, 150 watts at 4 ohms to each channel and can reach 320 watts rms to each channel at 2 ohms loads.

Fuses to the positive and negative rails should be:

8 ohms speakers = 1.5A plus 1.5A...these goes into the audio amplifier pcboard...output series fuse can be 3 to 3.5 amperes..slow blow fuses.

4 ohms speakers = 3A plus 3A ... these ones goes into the audio amplifier pcboard .... output series fuse to the speaker can be 6 amperes.

2 ohms speakers = 6A plus 6A ... these ones goes into the audio amplifier pcboard.. output series fuse to the speaker can be 12 amperes.

Electrolitic condensers for filtering you calculate... use 5000uf to each ampere...so....if your supply will power a single pcboard at 8 ohms...then it is 1.5 plus 1.5 amperes..then put 7500uf plus 7500uf or more as filters...rectifiers should be twice this power.

You see that for 2 ohms you gonna need 30 thousand microfarads to each rail...so... 30K plus 30K...and this to a single power amplifier..reason why i suggest you to use a series pass regulator that has capacitance multiplier effect or search for something alike Dx Power Supply..... you can find it at the Power Supply forum.... for sure others may fit, the electronic filtering reduces the ammount of capacitance from several electrolitics....this is too much expensive when you drain high current.

Primary fuses you divide the power of your transformer expressed in watts by your mains voltage...then you have the fuse, use the value or the immediate superior value found in the market.

Heatsinks:

To each 10 watts of audio power ( the maximum power you gonna reach depends your transformer power and depends on your speaker impedance) then use an aluminum blade of 10 by 10 centimeters (4 inches by 4 inches..so..squared)...this is the equivalent size to 10 watts of AUDIO power... so.... depending your power you can evaluate your heatsink...use fan blower anyway... this heatsink dimension (tested in laboratory, under 30 degrées centigrades environment being able to face a 10 watts RMS audio amplifier, operating class AB or class B, having sinusoidal signal in the output, undistorted or unclipped waveform)

This is to continuous.... music is average.... this results twice the needed size for music...so...you can calculate.

But Class A and Super A operation is different..generates too much heat and these calculation does not make any sense.... reason why i suggest to install fan blower having LM7808 or even LM7805 or other manufacturer, voltage regulator integrated circuits to power the fan, reducing voltage will reduce fan speed and fan noise....but be attention, these Voltage Regulator Chips have a limit of input voltage you should see in the datasheet.

regards,

Carlos

Regards
Juan

Last edited by vargasmongo3435; 14th February 2013 at 04:16 PM.
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Old 14th February 2013, 04:28 PM   #38
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Default The whole 9 yards

The whole nine yards

From Wikipedia, the free encyclopedia
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This article is about the phrase. For the film, see The Whole Nine Yards (film).
Click the image to open in full size. Click the image to open in full size.
A 1921 headline from The Spartanburg Herald-Journal in South Carolina reads "The Whole Six Yards of It." In 1956, the expression was used in a magazine for Kentucky outdoorsmen with the number of yards given as nine. This type of upward revision has been described as "phrase inflation."[1]


The whole nine yards is a phrase used to indicate “the full extent”, or “the whole thing,” as in, They took my wallet, my keys, my shoes, – the whole nine yards! Its origin is unknown and has been described as, "the most prominent etymological riddle of our time."[2]
The earliest recorded example of this phrase dates from 1956.[1][3] It is related to the expression "the whole six yards," used earlier in the rural South. Both phrases are variations on the whole ball of wax, first recorded in the 1880s.[4] They are part of a family of expressions in which an odd-sounding item, such as enchillada, shooting match, or shebang, is substituted for "ball of wax."[4] The choice of the number nine may be related the expression "to the nines" (to perfection).[nb 1]
The phrase was introduced to a national audience by Elaine Shepard in the Vietnam War novel The Doom Pussy (1967).[5] Use of the phrase became widespread in the 1980s and 1990s. Much of the interest in the phrase's etymology can be attributed to New York Times language columnist William Safire, who wrote extensively on this question.

The whole nine yards - Wikipedia, the free encyclopedia




Regards
Juan
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Old 14th February 2013, 04:41 PM   #39
wiljj78 is offline wiljj78  Philippines
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Thank you very much my dear Juan,

All informations above was descrived about the required power for Super A includes per channel, transformer capabilty in terms of load and filters, but i need to know about filters vs. power transistor qty. to match/meet the requirements of stereo in 2 ohms load for this particular stabilizer only.

Regards,
Wiljj78

Last edited by wiljj78; 14th February 2013 at 05:01 PM.
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Old 14th February 2013, 07:54 PM   #40
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oh wow but Willy Dx Super A is not to keep it at high volume levels and small loads 2 ohms load,
all the time is a fine designed amplifier for enjoyably experiences, what exactly are you looking for dear Willy power or high fidelity? I'm completely honest Dx Super A has it all, not need to look around for more stuff, but well wait for Carlos he design the Dx Regulator he probably got and answer for you.

Regards
Juan
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